<template>
  <view>
    <!-- 自定义组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="5"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-views" scroll-y="true" :style="{height: wh +'px'}" >
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-views-item',index === active ? 'active':'']" @click="activeChanged(index)">{{item.cat_name}}</view>
        </block>  
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view class="right-scroll-views" scroll-y="true" :style="{height: wh +'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <!-- 二级标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}</view>
          <!-- 渲染三级列表区域 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-list-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
                <!-- 图片 -->
              <img :src="item3.cat_icon">
                <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 当前设备可用的高度
        wh:0,
        // 分类列表数据
        cateList:[],
        active:0,
        // 二级分类的列表
        cateLevel2:[],
        scrollTop: 0
        
        
      };
    },
    onLoad() {
      // 获取屏幕高度
      const sysInfo = uni.getSystemInfoSync()
      // -50是搜索栏的高度
      this.wh = sysInfo.windowHeight -50
      // console.log(sysInfo);
      
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        
        this.cateList =res.message
         
          // 为二级分类赋值
        this.cateLevel2 =res.message[0].children
      },

      activeChanged(index){
        this.active = index
        this.cateLevel2 =this.cateList[index].children
        
        this.scrollTop=this.scrollTop === 0?1:0
      },
      
     gotoGoodsList(item3){
       uni.navigateTo({
         url:'/subpkg/goods_list/goods_list?id=' + item3.cat_id
       })
     },
     gotoSearch(){
       // console.log('Ok');
       uni.navigateTo({
         url:'/subpkg/search/search'
       })
     }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  
  .left-scroll-views{
    width: 120px;
    
    .left-scroll-views-item{
      background: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      // 包含
      &.active{
        background-color: #fff;
        position: relative;
        
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-list-item{
    width: 33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px
    }
  }
}
</style>
